Where do I start. I have been a hair stylist for 10 years but this is just my opinion:
Basically when you use permanent hair colour on you hair the colour disturbs your natural pigment, regardless of your original colour. Most hair colour is mixed with a developer in your case I'm guessing that it will have been mixed with either 3% or 6% [strength], either way, it will have disturbed your natural pigment.
So what does that mean for you?
Well, if you try to remove the colour that is on your hair at the moment the colour will firstly be hard to lighten because of the depth of the colour. Secondly the end result will be very warm and artificial looking.
This is a job for a well educated stylist to carry out, and even then its not a guarantee that the colour will lift out even. Once enough of the colour has been removed you will then have to have either a toner or another colour applied or a combination of both.
Its very hard to explain this process to someone who has not got the background knowledge to support the process {I mean that in a non-patronising} way.
But basically there is no miracle solution. The cost of this process could be anywhere from �60-�200 depending on the rank of stylist that works on your hair, the length of your hair and the desired end result.
I hope this help, if you need any more advice just message me.
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One other option would be to switch to a semi-permanent {and by this i mean a TRUE sem-permanent like L'Oreal Symbio}. This will mean that you can grow the colour out without it looking ghastly.
p.s I would strongly advise not do try this process at home. I wouldn't do it away from the salon and I'm a stylist.
Good Luck